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Abstract

We present a variable focus lens for the THz range. The focal length can be changed by pumping a medical white oil in and out of the lens body. Due to the optical transparency of the liquid and a similar refractive index in the visible frequency range, the THz beam path can be aligned using conventional optical light sources. This type of lens might find applications in terahertz based quality control, stand-off detection and wireless communication systems.

Figures (6)

Principle of the liquid filled variable focus lens. Side view of the lens for a higher and a lower filling level (solid and dashed lines) corresponding to a shorter and longer focal lengths f1 and f2, respectively.